<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .one {
            margin: 50px;
            width: 100px;
            height: 100px;
            background-color: red;
            float: left;
        }
        .two {
            width: 100px;
            height: 100px;
            background-color: green;
            /*clear: both;*/
            /*float: left;*/
        }
        .three {
            width: 100px;
            height: 100px;
            background-color: blue;
            /*float: left;*/
        }
    </style>
</head>
<body>
<div class="one">

</div>
<div class="two">

</div>
<div class="three">

</div>
</body>
</html>